http://y7yea4pmqqtznb33qiugvysyn2bob5v62e4pvoadoibrwkq3tsddjeyd.onion/glossary/security-question
We recommend you treat them as any other password : create a long, novel, random, phrase to answer them, and record that somewhere safe. So the next time your bank asks you your mother's maiden name, you should be ready to answer something like "Correct Battery Horse Staple."